Impact of probing volume from different mechanical measurement methods on elastic properties of thermally sprayed Ni-based coatings on a mesoscopic scale

Margadant, N.; Neuenschwander, Jiirg; Stauss, Sven; Kaps, Harald; Kulkarni, Anand; Matějíček, Jiří; Rössler, Gerd

doi:10.1016/j.surfcoat.2005.02.201

Cited by 32 publications

(9 citation statements)

References 13 publications

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“…the amplitude dependence of the elastic moduli [32]), the map in Fig. 7 comprises only the results obtained by ultrasonic methods, in particular by pulse-echo [25], RUS [19,26] or by their combination [23]; therefore, all these results refer to very small straining amplitudes and high straining rates typical for ultrasound. The CS materials obviously possess a unique combination of high E OOP /E bulk ratio and very weak anisotropy.…”

Section: Rus Resultsmentioning

confidence: 99%

“…All samples were oriented so that longest and the shortest edge of the sample were always perpendicular to the spraying direction and aligned with the directions of motion of the nozzle during spraying. However, it was assumed (as usual for the sprayed materials [19,23,25,26]) that all samples exhibit transversal isotropy, i.e. that all directions perpendicular to the spraying direction are equivalent, and the elasticity of the material can be fully described by five independent elastic coefficients.…”

Section: Resonant Ultrasound Spectrocopymentioning

confidence: 99%

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Elastic moduli and elastic anisotropy of cold sprayed metallic coatings

Seiner

Sedlák

Huang³

et al. 2016

Surface and Coatings Technology

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such as plasma spraying [8,9,10], the CS process does not involve substantial heating or melting of the sprayed powders. Instead, the formation of the coating arises from a severe plastic deformation of the accelerated powder particles upon their impingement at the substrate [11,12]. Thereby, the oxidation or phase changes in the feedstock material are effectively reduced, as well as e.g. the magnitude of the secondary residual stresses arising from the thermal expansion mismatch [13]. As such, CS has recently received a lot of attention as a novel method applicable for sensitive metals and alloys that readily undergo chemical or structural changes at elevated temperatures. Among the sprayed metallic prepared by water-stabilized plasma (WSP) spraying. In all reported cases, the difference between the in-plane and out-of plane properties of the coatings were significant, with the values of the ratio α = E OOP /E IP between the out-of-plane Young's modulus (E OOP ) and the in-plane Young's modulus (E IP ) ranging from 0.36 (for APS [19]) to 0.87 (for WSP [23]). Here we apply this method to determine the elastic constants and the strength of anisotropy for pure copper, aluminum, titanium and nickel coatings prepared by CS. The main advantage of the RUS method is that it enables the determination of all independent elastic constants of an anisotropic solid from measurements of one small sample. In addition, the RUS enables also a direct assessment of the internal friction parameter of the examined material Q −1 [21], which may bring an additional information on the integrity of the sprayed material or on density and activity of defects in it [24].

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Section: Rus Resultsmentioning

confidence: 99%

Section: Resonant Ultrasound Spectrocopymentioning

confidence: 99%

Elastic moduli and elastic anisotropy of cold sprayed metallic coatings

Seiner

Sedlák

Huang³

et al. 2016

Surface and Coatings Technology

View full text Add to dashboard Cite

show abstract

“…In fact, the rapid quenching of a molten particle and its solidification in a metastable state may result in greater hardness due to strengthening by solid solution as reported in another study [10]. Since nano-hardness was achieved by indentation at low penetration depth (300 nm) within the particle, it mainly reflects the intralamellar properties of the sprayed coating [29]. Instead the micro-hardness obtained at greater penetration (3 N max load) reflects the interlamellar properties [10,18].…”

Section: Microstructural and Mechanical Characterization Of Coatingsmentioning

confidence: 89%

Microstructural Characteristics and Tribological Behavior of HVOF-Sprayed Novel Fe-Based Alloy Coatings

et al. 2014

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Thermally-sprayed Fe-based coatings have shown their potential for use in wear applications due to their good tribological properties. In addition, these kinds of coatings have other advantages, e.g., cost efficiency and positive environmental aspects. In this study, the microstructural details and tribological performances of Fe-based coatings (Fe-Cr-Ni-B-C and Fe-Cr-Ni-B-Mo-C) manufactured by High Velocity Oxygen Fuel (HVOF) thermal spray process are evaluated. Traditional Ni-based (Ni-Cr-Fe-Si-B-C) and hard-metal (WC-CoCr) coatings were chosen as references. Microstructural investigation (field-emission scanning electron microscope FESEM and X-Ray diffractometry XRD) reveals a high density and low oxide content for HVOF Fe-based coatings. Particle melting and rapid solidification resulted in a metastable austenitic phase with precipitates of mixed carbides and borides of chromium and iron which lead to remarkably high nanohardness. Tribological performances were evaluated by means of the ball on-disk dry sliding wear test, the rubber-wheel dry particle abrasion test, and the cavitation erosion wear test. A higher wear resistance validates Fe-based coatings as a future alternative to the more expensive and less environmentally friendly Ni-based alloys.

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“…-Starting from SEM micrographs taken at different magnifications, the elastic properties were obtained at different length scales to capture the typical size-dependent behaviour of the response of thermal spray coatings [42,43]. Numerical results were compared to experimental measurements of the elastic modulus performed at the micro-scale (by depth-sensing micro-indentation on polished cross-sections and top surfaces) and at the macro-scale (by three-point bending tests).…”

Section: Introductionmentioning

confidence: 99%

Microstructure-based thermo-mechanical modelling of thermal spray coatings

et al. 2015

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This paper demonstrates how microstructure-based finite element (FE) modelling can be used to interpret and predict the thermo-mechanical behaviour of thermal spray coatings. Validation is obtained by comparison to experimental and/or literature data.Finite element meshes are therefore constructed on SEM micrographs of high velocity oxygen-fuel (HVOF)-sprayed hardmetals (WC-CoCr, WC-FeCrAl) and plasma-sprayed Cr2O3, employed as case studies. Uniaxial tensile tests simulated on high-magnification micrographs return micro-scale elastic modulus values in good agreement with depth-sensing Berkovich micro-indentation measurements. At the macro-scale, simulated and experimental three-point bending tests are also in good agreement, capturing the typical size-dependency of the mechanical properties of these materials. The models also predict the progressive stiffening of porous plasma-sprayed Cr2O3 due to crack closure under compressive loading, in agreement with literature reports.Refined models of hardmetal coatings, accounting for plastic behaviours and failure stresses, predict crack initiation locations as observed by indentation tests, highlighting the relevance of stress concentrations around microstructural defects (e.g. oxide inclusions).Sliding contact simulations between a hardmetal surface and a small spherical asperity reproduce the fundamental processes in tribological pairings. The experimentally observed "wavy" morphologies of actual wear surfaces are therefore explained by a mechanism of micro-scale plastic flow and matrix extrusion

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Impact of probing volume from different mechanical measurement methods on elastic properties of thermally sprayed Ni-based coatings on a mesoscopic scale

Cited by 32 publications

References 13 publications

Elastic moduli and elastic anisotropy of cold sprayed metallic coatings

Elastic moduli and elastic anisotropy of cold sprayed metallic coatings

Microstructural Characteristics and Tribological Behavior of HVOF-Sprayed Novel Fe-Based Alloy Coatings

Microstructure-based thermo-mechanical modelling of thermal spray coatings

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